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Engineering Materials
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Engineering Materials Practice Set-8

May 16, 2021

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Page 1 of 4

1. Carbon in iron is an example of

Substitutional solution

Intermetallic compounds

Interstitial solid solution

All of the above

2. The machinability of steel is increased by

Phosphorous, lead and sulphur

Sulphur, graphite and aluminium

Phosphorous and aluminium

Silicon and sulphur

3. Free cutting steels

Do not exist

Contain carbon in free form

Are used where ease in machining is the criterion

Require least cutting force

4. The hardness of steel increases if it contains

Cementite

Pearlite

Austenite

Martensite

5. The hardness is the property of a material due to which it

Breaks with little permanent distortion

Can cut another metal

Can be rolled or hammered into thin sheets

Can be drawn into wires

6. Which of the following is used for bearing liner?

Babbitt metal

Gun metal

Bell metal

Bronze

7. Cold rolled steel sheets contain carbon of the following order

0.6%

0.4%

0.2%

0.1%

8. Cupola produces following material

Cast iron

Wrought iron

Pig iron

Malleable iron

9. Weld decay is the phenomenon found with

Stainless steel

Nonferrous materials

Mild steel

Cast iron

10. Perminvar alloy having constant permeability is an alloy of

Nickel, copper and zinc

Nickel, copper and iron

Iron, zinc and bismuth

Copper, nickel and antimony

Page 2 of 4

11. Beryllium bronze has

(D) None of these

(C) Both (A) and (B)

(B) High fatigue limit

(A) High yield point

12. Bronze contains

70% copper and 30% zinc

85 - 92% copper and rest tin with little lead and nickel

70 - 75% copper and rest tin

90% copper and 10% tin

13. Argentite is the principal ore or raw material for

Silver

Tin

Aluminium

Zinc

14. Steel made from phosphate iron is

Hard

Tough

Ductile

Brittle

15. Corrosion resistance of steel is increased by adding

Chromium and nickel

Nickel and molybdenum

Aluminium and zinc

Tungsten and sulphur

16. Gun metal contains

70% copper and 30% zinc

90% copper and 10% tin

70 - 78% copper and rest tin

85 - 92% copper and rest tin with little lead and nickel

17. Which is false statement about tempering? Tempering is done to

Improve ductility

Release stresses

Improve machinability

Improve toughness

18. Melting point of iron is

1489°C

1712°C

1539°C

1601°C

19. Tungsten in high speed steel provides

Sharp cutting edge

Toughness

Wear resistance

Hot hardness

20. An example of amorphous material is

Zinc

Silver

Glass

Lead

Page 3 of 4

21. Compressive strength of grey cast iron in tonnes/cm is of the order of

57

35

1015

710

22. Phosphor bronze contains

0.5% of phosphorous

None of the above

1% phosphorous

2.5% phosphorous

23. The alloying element which reduces the formation of iron sulphide in steel is

Vanadium

Manganese

Chromium

Nickel

24. Preheating is essential in welding

High speed steel

Cast iron

All nonferrous materials

All of the above

25. Shock resisting steels should have

Toughness

Low tensile strength

Low wear resistance

Low hardness

26. Nimonic contains __________ percentage of nickel as that of Inconel.

Less

None of these

Same

More

27. The alloy used for making electrical resistances and heating elements is

Magnin

Invar

Nichrome

Elinvar

28. Aluminium bronze contains aluminium and copper in the ratio of

50 : 50

10 : 90

60 : 40

40 : 60

29. Which of the following is the binding material in cemented carbides?

Vanadium

Nickel

Iron

Cobalt

30. Drop forging dies contain carbon of the order of

0.6 to 0.7%

0.7 to 0.9%

0.1 to 0.2%

0.25 to 0.5%

Page 4 of 4

31. Delta metal is an alloy of

Copper, zinc and iron

Iron, nickel and copper

Iron, aluminium and magnesium

Iron, lead and tin

32. The crystal structure of brass is

Orthorhombic crystalline structure

B.C.C.

F.C.C.

H.C.P.

33. Manganese in steel increases its

Ductility

Tensile strength

Fluidity

Hardness

34. Sulphur in cast iron

Aids fusibility and fluidity

Increases hardness and brittleness

Make the iron white and hard

Makes the iron soft and easily machinable

35. Hardness of upper bainite (acicular structure) is about

RC 48

RC 80

RC 57

RC 65

36. High carbon steel carries carbon percentage

0.8 to 1.5%

0.3 to 0.6%

0.6 to 0.8%

0.1 to 0.3%

37. Permalloy is a

None ferrous alloy

Polymer

Nickel and iron alloy having high permeability

Kind of stainless steel

38. Connecting rod is usually made of

Aluminium

Low carbon steel

High carbon steel

Medium carbon steel

39. The presence of sulphur in pig iron makes

It easily machinable

It brittle

It hard

The casting unsound

40. Chromium in steel

Gives ductility, toughness, tensile strength and anti-corrosion properties

Improves cutting ability and reduces hardenability

Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

Improves wear resistance, cutting ability and toughness

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VideRime

A Demrot is the founder of VideRime Online Learning, a leading engineering website. He did his BE Civil and M.Tech Structure from RGPV University, Bhopal and has been working as an Assistant Professor in a reputed college.

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